Multi-motor drive system with differential speed regulated by CVT

ABSTRACT

The present invention relates to a multi-motor driving common load, such as two or more motors, in which CVT is installed between individual motor and a wheel group at individual load, when the multi-motor, such as two or more motors, installed at the common load structure individually drives the individual load through the arranged CVT to get rotational speed difference, and to make differential speed drive operation through the speed ratio variation by the CVT.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention relates to two or more independent motors installed at the common load, through speed ratio variation made by the CVT individually installed between the individual motor and the individual load driven, to match the differential speed operation drive between the loads driven by individual motor.

(b) Description of the Prior Art

Traditionally, when two or more loads installed at the common load are driven through differential speed regulation by single motor, the differential speed function is often achieved by differential wheel group, which type has shortcomings including transmission efficiency loss, space used, and weight; if a vehicle is driven by two motors, two independent drive circuits are often installed, the central control unit refers to the following parameters, such as vehicle speed, output rotational speed detection device, steeling wheel shift values, as well as the road gradient, the center of gravity in the vehicle after load, and processes for controlling the two independent drive circuits, and then the two independent drive circuits respectively drive the two motors, to make close loop or semi-close loop rotational speed control between the two motors for achieving differential speed function, but which type has shortcomings including high cost and complex system operation.

SUMMARY OF THE INVENTION

The present invention relates to a multi-motor driving common load, such as two or more motors, in which CVT is installed between individual motor and a wheel group at individual load, when the multi-motor, such as two or more motors, installed at the common load structure individually drives the individual load through the arranged CVT to get rotational speed difference, and to make differential speed drive operation through the speed ratio variation by the CVT.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing an embodiment of the multi-motor drive system with differential speed regulated by continuous variable transmission CVT;

FIG. 2 is a schematic view showing an embodiment of the multi-motor drive system with differential speed regulated by continuous variable transmission CVT in FIG. 1 to be additionally installed with a controllable clutch unit;

FIG. 3 is a schematic view showing an embodiment of two sets of the multi-motor drive systems with differential speed regulated by continuous variable transmission CVT in FIG. 1 to be installed at a four-wheel drive common load body L200;

FIG. 4 is a schematic view showing an embodiment of the system in FIG. 3 to be additionally installed with a controllable clutch unit;

FIG. 5 is a schematic view showing an embodiment of the multi-motor drive systems with differential speed regulated by continuous variable transmission CVT and an engine power drive unit are simultaneously installed at a common load body L300 to form a hybrid power system;

FIG. 6 is a schematic view showing an embodiment of the system in FIG. 5 to be additionally installed with a controllable clutch unit;

FIG. 7 is a schematic view showing an embodiment of the multi-motor drive systems with differential speed regulated by continuous variable transmission CVT, an engine power drive unit, and an electric storage-discharge unit ESD100 are simultaneously installed at a common load body L400 to form a hybrid power system; and

FIG. 8 is a schematic view showing an embodiment of the system in FIG. 7 to be additionally installed with a controllable clutch unit.

DESCRIPTION OF MAIN COMPONENT SYMBOLS

-   CCU100, CCU200, CCU300, CCU400: Central control unit -   CL100, CL200, CL300, CL400: Controllable clutch unit -   CVT100, CVT200, CVT300, CVT400: Continuous variable transmission -   ECU100, ECU200, ECU300, ECU400: Electric control unit -   EMU100: Electric energy management unit -   ESD100: Electric storage-discharge unit -   FC100: Fuel control unit -   G100: Generator -   ICE100: Engine -   L100, L200, L300, L400: Common load body -   M100, M200, M300, M400: Motor -   MI100, MI200, MI300, MI400: User interface -   SD100: Engine speed detecting device -   T100, T200, T300, T301, T400: Transmission -   TANK100: Tank -   W100, W200, W300, W301, W400, W401: Wheel group

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention relates to a multi-motor driving common load, such as two or more motors, in which CVT is installed between individual motor and a wheel group at individual load, when the multi-motor, such as two or more motors, installed at the common load structure individually drives the individual load through the arranged CVT to get rotational speed difference, and to make differential speed drive operation through the speed ratio variation by the CVT.

The CVT in the present invention is a continuous variable transmission, which can automatically change the speed ratio with the load state, or change the speed ratio in accepting external manipulation, including a variety of types, such as rubber belt type, metal belt type, and chain type CVT, or electronic continuous variable transmission (ECVT), or friction disk type, or conventional iso-axis continuous variable transmission.

The common load in the present invention refers to wheel-type vehicle, tracked vehicle, rail vehicle, or ship driven by at least two independent motors installed, or conveyor for stream of people or logistics, or industrial equipment driven by at least two motors; the common load may be further equipped with engine power system, free wheel, and related user interface unit.

The various embodiments of the present invention are described as following.

FIG. 1 is a schematic view showing an embodiment of the multi-motor drive system with differential speed regulated by continuous variable transmission CVT.

As shown in FIG. 1, for common load body L100, motor M100 is installed to drive wheel group W100 placed at the load through continuous variable transmission CVT100 and transmission T100, and motor M200 is installed to drive wheel group W200 placed at the load through continuous variable transmission CVT200 and transmission T200, if the wheel group W100 and the wheel group W200 placed at the load are driven with differential speed, the continuous variable transmission CVT100 and the continuous variable transmission CVT200 automatically regulate the speed ratio with the load variation, to coordinate with differential speed between the wheel group W100 and the wheel group W200 placed at the load, in which:

-   -   motors M100, M200: constituted by rotary motors, which are AC or         DC, brushless or brush, synchronous or non-synchronous, internal         or external rotation type;     -   continuous variable transmissions CVT100, CVT200: related to         continuous variable transmissions, which can automatically         change the speed ratio with the load state, or change the speed         ratio in accepting external manipulation, including a variety of         types, such as rubber belt type, metal belt type, and chain type         CVT, or electronic continuous variable transmission (ECVT), or         friction disk type, or conventional iso-axis continuous variable         transmission;     -   transmission T100: related to fixed speed ratio, variable speed         ratio, or stepless variable speed transmission, which is         constituted by mechanical gear unit, sprocket unit, pulley unit,         or linkage group; and is selectable as needed;     -   electric control unit ECU100: constituted by electric machine         and/or solid state power element, and/or electronic element,         and/or microprocessor, and/or related software, for accepting         the control of user interface MI100 and/or central control unit         CCU100, wherein a motor drive control circuit is installed         within the electric control unit ECU100 for manipulating         rotational speed, torque, rotary direction, and current of the         parallel motors M100 and M200; or motor drive control circuits         are individually arranged for motors M100 and M200 individually         installed within the electric control unit ECU100, for         individually manipulating rotational speed, torque, rotary         direction, and current of the motors M100 and M200, which do not         involve the close loop or semi-close loop rotational speed         control between the two motors to achieve the differential speed         function; the differential speed operation between the loads         with differential speed regulated by the continuous variable         transmission CVT installed between the individual motor and the         load;

if a system adopts continuous variable transmission CVT accepting external manipulation for changing speed ratio, electric control unit ECU100 includes drive control circuits for user interface MI100 accepting artificial manipulation and/or continuous variable transmission CVT controlled by central control unit CCU100;

-   -   electric energy management unit EMU100: constituted by electric         machine, and/or solid state power element, and/or electronic         element, and/or microprocessor, and/or related software, for         controlling output voltage and current and charging voltage and         current of the electric storage-discharge unit ESD100, to start         and stop charging;     -   central control unit CCU100: related to analog or digital         control device, or both mixed, constituted by electric machine         and/or solid state power element, and/or including         microprocessor, and/or control software, and/or constituted by         related circuit element, for following the command of the user         interface MI100, and/or for setting control mode and further         controlling the operation of the system;     -   user interface MI100: related to linear analog or digital         control device, or both mixed, constituted by operating         mechanism, and/or electric machine, and/or solid state circuit,         for linking with the central control unit CCU100, to control the         operation of the system;     -   electric storage-discharge unit ESD100: constituted by various         rechargeable secondary battery, or capacitor, or super         capacitor.

Through the operation of the above device, if common load body L100 is driven for operation, and wheel group W100 and wheel group W200 make differential speed operation, which are installed at the load, continuous variable transmission CVT100 and continuous variable transmission CVT200 individually regulate speed ratio with the load variation of the wheel group W100 and the wheel group W200 installed at the load, to facilitate the differential speed operation drive between the wheel group W100 and the second wheel group W200 installed at the load.

In addition, for the multi-motor drive system with differential speed regulated by CVT, except for directly driving the load through CVT, or through CVT and transmission, controllable clutch unit CL100 is additionally installed between continuous variable transmission CVT100 and transmission T100, and controllable clutch unit CL200 is additionally installed between continuous variable transmission CVT200 and transmission T200. FIG. 2 is a schematic view showing an embodiment of the multi-motor drive system with differential speed regulated by continuous variable transmission CVT in FIG. 1 to be additionally installed with a controllable clutch unit.

The controllable clutch units CL100 and CL200 installed between the continuous variable transmission CVT100 and the transmission T100, and between the continuous variable transmission CVT200 and the transmission T200, are used to individually control through linking transmission or cutting separation between the continuous variable transmission CVT100 and the transmission T100, and between the continuous variable transmission CVT200 and the transmission T200;

-   -   controllable clutch units CL100, CL200: related to clutch device         or structure with the function of linking transmission or         cutting separation, which is driven by manpower, and/or         electricity, and/or magnetic power, and/or machine power, and/or         gas pressurer, and/or liquid pressure, and/or centrifugal force,         and which has rotary input side and rotary output side.

For the multi-motor drive system with differential speed regulated by CVT, two or more sets of the multi-motor drive systems with differential speed regulated by CVT are further installed at four- or more-wheel drive system.

FIG. 3 is a schematic view showing an embodiment of two sets of the multi-motor drive systems with differential speed regulated by continuous variable transmission CVT in FIG. 1 to be installed at a four-wheel drive common load body L200.

As shown in FIG. 3, the main components include:

-   -   common load body L200: two sets of the multi-motor drive systems         with differential speed regulated by CVT installed at the common         load body L200, in which the first set of the multi-motor drive         system with differential speed regulated by CVT is installed at         the front end of the common load body L200, and the second set         of the multi-motor drive system with differential speed         regulated by CVT is installed at the back end of the common load         body L200, wherein:

the first set of the multi-motor drive system with differential speed regulated by CVT includes:

-   -   motors M100, M200: constituted by rotary motors, which are AC or         DC, brushless or brush, synchronous or non-synchronous, internal         or external rotation type;     -   continuous variable transmissions CVT100, CVT200: related to         continuous variable transmissions, which can automatically         change the speed ratio with the load state, or change the speed         ratio in accepting external manipulation, including a variety of         types, such as rubber belt type, metal belt type, and chain type         CVT, or electronic continuous variable transmission (ECVT), or         friction disk type, or conventional iso-axis continuous variable         transmission; and     -   transmissions T100, T200: related to fixed speed ratio, variable         speed ratio, or stepless variable speed transmissions, which are         constituted by mechanical gear units, sprocket units, pulley         units, or linkage groups; and are selectable as needed;

the second set of the multi-motor drive system with differential speed regulated by CVT includes:

-   -   motors M300, M400: constituted by rotary motors, which are AC or         DC, brushless or brush, synchronous or non-synchronous, internal         or external rotation type;     -   continuous variable transmissions CVT300, CVT400: related to         continuous variable transmissions, which can automatically         change the speed ratio with the load state, or change the speed         ratio in accepting external manipulation, including a variety of         types, such as rubber belt type, metal belt type, and chain type         CVT, or electronic continuous variable transmission (ECVT), or         friction disk type, or conventional iso-axis continuous variable         transmission; and     -   transmissions T300, T400: related to fixed speed ratio, variable         speed ratio, or stepless variable speed transmissions, which are         constituted by mechanical gear units, sprocket units, pulley         units, or linkage groups;     -   electric control unit ECU200: constituted by electric machine         and/or solid state power element, and/or electronic element,         and/or microprocessor, and/or related software, for accepting         the control of user interface MI200 and/or central control unit         CCU200, wherein a motor drive control circuit is installed         within the electric control unit ECU200 for manipulating         rotational speed, torque, rotary direction, and current of the         parallel motors M100 and M200, and M300 and M400; or two motor         drive control circuits are installed within the electric control         unit ECU200, in which one motor drive control circuit is used to         control the parallel motors M100 and M200, including controlling         the rotational speed, torque, rotary direction, and current of         the motors M100 and M200, and another motor drive control         circuit is used to control the parallel motors M300 and M400,         including controlling the rotational speed, torque, rotary         direction, and current of the motors M300 and M400; or motor         drive control circuits are individually arranged for motors         M100, M200, M300, and M400 individually installed within the         electric control unit ECU200, for individually manipulating         rotational speed, torque, rotary direction, and current of the         motors M100, M200, M300, and M400; which do not involve the         close loop or semi-close loop rotational speed control between         the two motors to achieve the differential speed function; the         differential speed operation between the loads with differential         speed regulated by the continuous variable transmission CVT         installed between the individual motor and the load;

if a system adopts continuous variable transmission CVT accepting external manipulation for changing speed ratio, electric control unit ECU200 includes drive control circuits for user interface MI100 accepting artificial manipulation and/or continuous variable transmission CVT controlled by central control unit CCU200;

-   -   electric control unit ECU100: constituted by electric machine         and/or solid state power element, and/or electronic element,         and/or microprocessor, and/or related software, for controlling         output voltage and current and charging voltage and current of         the electric storage-discharge unit ESD100, to start and stop         charging;     -   central control unit CCU200: related to analog or digital         control device, or both mixed, constituted by electric machine         and/or solid state power element, and/or including         microprocessor, and/or control software, and/or constituted by         related circuit element, for following the command of the user         interface MI100, and/or for setting control mode and further         controlling the operation of the system;     -   user interface MI100: related to linear analog or digital         control device, or both mixed, constituted by operating         mechanism, and/or electric machine, and/or solid state circuit,         for linking with the central control unit CCU200, to control the         operations of the first set of the multi-motor drive system with         differential speed regulated by CVT, and the second set of the         multi-motor drive system with differential speed regulated by         CVT in turn; and     -   electric storage-discharge unit ESD100: constituted by various         rechargeable secondary battery, or capacitor, or super         capacitor.

The system, as shown in FIG. 4, includes one or more of the following operational functions:

1. for the first set of the multi-motor drive system with differential speed regulated by CVT installed at the front end of the common load body L200, the continuous variable transmission CVT100 and the continuous variable transmission CVT200 individually regulate the speed ratio with the load variation, to coordinate with differential speed between the wheel group W100 and the second wheel group W200 placed at the load;

2. for the second set of the multi-motor drive system with differential speed regulated by CVT installed at the back end of the common load body L200, the continuous variable transmission CVT300 and the continuous variable transmission CVT400 individually regulate the speed ratio with the load variation, to coordinate with differential speed between the wheel group W300 and the second wheel group W400 placed at the load; and

3. for the first and second sets of the multi-motor drive systems with differential speed regulated by CVT respectively installed at the front and back ends of the common load body L200, between the two systems, the continuous variable transmissions CVT100, CVT200, CVT300, and CVT400 individually regulate the speed ratio with the load variation, to coordinate with differential speed among the wheel groups W100, W200, W300, and W400 placed at the load.

In addition, for the first set of the multi-motor drive system with differential speed regulated by CVT, except for directly driving the load through CVT, or driving the load through CVT and transmission, furthermore, the controllable clutch unit CL100 is additionally installed between the continuous variable transmission CVT100 and the transmission T100, and the controllable clutch unit CL200 is additionally installed between the continuous variable transmission CVT200 and the transmission T200, and for the second set of the multi-motor drive system with differential speed regulated by CVT, the controllable clutch unit CL300 is additionally installed between the continuous variable transmission CVT300 and the transmission T300, and the controllable clutch unit CL400 is additionally installed between the continuous variable transmission CVT400 and the transmission T400. FIG. 4 is a schematic view showing an embodiment of the system in FIG. 3 to be additionally installed with a controllable clutch unit.

The controllable clutch units CL100 and CL200 installed between the continuous variable transmission CVT100 and the transmission T100, and between the continuous variable transmission CVT200 and the transmission T200, are used to individually control through linking transmission or cutting separation between the continuous variable transmission CVT100 and the transmission T100, and between the continuous variable transmission CVT200 and the transmission T200.

The controllable clutch units CL300 and CL400 installed between the continuous variable transmission CVT300 and the transmission T300, and between the continuous variable transmission CVT400 and the transmission T400, are used to individually control through linking transmission or cutting separation between the continuous variable transmission CVT300 and the transmission T300, and between the continuous variable transmission CVT400 and the transmission T400;

-   -   controllable clutch units CL100, CL200, CL300, CL400: related to         clutch device or structure with the function of linking         transmission or cutting separation, which is driven by manpower,         and/or electricity, and/or magnetic power, and/or machine power,         and/or gas pressurer, and/or liquid pressure, and/or centrifugal         force, and which has rotary input side and rotary output side.

The multi-motor drive system with differential speed regulated by CVT is further applied to hybrid power drive system.

FIG. 5 is a schematic view showing an embodiment of the multi-motor drive systems with differential speed regulated by continuous variable transmission CVT and an engine power drive unit are simultaneously installed at a common load body L300 to form a hybrid power system.

As shown in FIG. 5, the main components include:

-   -   common load body L300: one end of the common load installed with         the multi-motor drive system with differential speed regulated         by the continuous variable transmission CVT100 and the         continuous variable transmission CVT200;

another end of the common load body L300 installed with an engine power system constituted by an engine ICE100 and a transmission T301 with the functions of clutch, speed change, and differential speed, for wheel group W301 and wheel group W401 driving the load through the transmission T301;

-   -   motors M100, M200: constituted by rotary motors, which are AC or         DC, brushless or brush, synchronous or non-synchronous, internal         or external rotation type;     -   generator G100: constituted by generator, which are AC or DC,         brushless or brush, synchronous or non-synchronous, internal or         external rotation type; in which the generator G100 is installed         between the engine ICE100 and the transmission T301, or at the         non-engine coupling side of the transmission T301, or at the         unit driven by the transmission T301;     -   continuous variable transmissions CVT100, CVT200: related to         continuous variable transmissions, which can automatically         change the speed ratio with the load state, or change the speed         ratio in accepting external manipulation, including a variety of         types, such as rubber belt type, metal belt type, and chain type         CVT, or electronic continuous variable transmission (ECVT), or         friction disk type, or conventional iso-axis continuous variable         transmission; and     -   electric control unit ECU300: constituted by electric machine         and/or solid state power element, and/or electronic element,         and/or microprocessor, and/or related software, for accepting         the control of user interface MI300 and/or central control unit         CCU300, to control the power generation operation timing of the         generator G100 and the voltage and current of the generating         power, in which one motor drive control circuit is installed         within the electric control unit ECU300 to control the         rotational speed, torque, rotary direction, and current of the         parallel motors M100 and M200; or motor drive control circuits         individually arranged for the motors M100 and M200 are installed         within the electric control unit ECU300 to individually control         the rotational speed, torque, rotary direction, and current of         the parallel motors M100 and M200, which do not involve the         close loop or semi-close loop rotational speed control between         the two motors to achieve the differential speed function; the         differential speed operation between the loads with differential         speed regulated by the continuous variable transmission CVT         installed between the individual motor and the load.

If a system adopts continuous variable transmission CVT accepting external manipulation for changing speed ratio, electric control unit ECU300 includes drive control circuits for user interface MI100 accepting artificial manipulation and/or continuous variable transmission CVT controlled by central control unit CCU300;

-   -   central control unit CCU300: related to analog or digital         control device, or both mixed, constituted by electric machine         and/or solid state power element, and/or microprocessor         including control software, and/or related circuit element, for         following the command of the user interface MI100, or for         setting control mode, and/or the feedback signal of the engine         speed detecting device SD100, and further controlling the         operation of the system;     -   user interface MI100: related to linear analog or digital         control device, or both mixed, constituted by operating         mechanism, and/or electric machine, and/or solid state circuit,         for linking with the central control unit CCU300, to control the         operation of the multi-motor drive system with differential         speed regulated by the continuous variable transmission CVT100         and the continuous variable transmission CVT200, and the         operation of the engine power system;     -   transmissions T100, T200: related to fixed speed ratio, variable         speed ratio, or stepless variable speed transmissions, which are         constituted by mechanical gear units, sprocket units, pulley         units, or linkage groups; and are selectable as needed; and     -   transmission T301: constituted by transmission component with         the functions of clutch, and/or speed change, and/or         differential speed.

By way of the operations of the above units, if the common load body L300 is driven for operation, and the wheel groups W100 and W200 installed at the load make differential speed operation, the continuous variable transmission CVT100 and the continuous variable transmission CVT200 individually make speed ratio regulation with the load variation of the wheel group W100 and the wheel group W200 installed at the load, to facilitate the differential speed operation drive between the wheel group W100 and the second wheel group W200 installed at the load.

The system is installed with the required fuel control unit FC100, tank TANK100, and/or engine speed detecting device SD100 for the control of the engine drive operation, including:

-   -   fuel control unit FC100: related to power-driven servo unit         and/or mechanical and/or current force-type drive unit for         accepting the direct control from central control unit CCU300         and/or engine speed detecting device SD100, for controlling the         fuel supply status of the engine ICE100, and then for         controlling the rotational speed and the torque force of the         engine ICE100;     -   tank TANK100: used for engine fuel storage, through the fuel         pipeline and the fuel control unit FC100 between the tank         TANK100 and the engine ICE100, for controlling the fuel to the         engine ICE100; and     -   engine speed detecting device SD100: related to analog or         digital rotational speed detecting device, which transfers the         amount of angular displacement to the corresponding physical         signal, and/or substituted by analog voltage value or frequency         value of the generator G100, for transmitting the engine         rotational speed signal to the central control unit CCU300,         and/or directly controlling the fuel to the engine from the fuel         control unit FC100, and/or the engine speed detecting device         SD100 constituted by mechanical detecting structure, such as         centrifugal type, mechanically interacting with the fuel control         unit FC100 to control the operation of the engine ICE100; the         above types selected with the system features.

The hybrid power system, as shown in FIG. 5, includes one or more of the following operational functions, including:

-   -   the power system, driven by the engine ICE100, driving the wheel         group W301 and the wheel group W401, for driving the common load         body L300; and/or     -   the engine ICE100 operating within the range of rotational         speed, in which lower fuel consumption and higher output power,         i.e. more fuel-efficient operation region with best break         specific fuel consumption, to drive the generator G100, and the         generating power directly, or through the motor drive control         circuit installed within the electric control unit ECU300,         controlling the operation of the motor M100 and the motor M200         driven, for driven the common load body L300.

As shown in FIG. 5, the multi-motor drive system with differential speed regulated by continuous variable transmission CVT and the engine power drive unit are installed at the common load body L300 to constitute the hybrid power system, in which, for the multi-motor drive system with differential speed regulated by continuous variable transmission CVT installed at the common load body L300, the load is directly driven by the continuous variable transmission CVT, or driven by the continuous variable transmission CVT and the transmission, furthermore, the controllable clutch unit CL100 is additionally installed between the continuous variable transmission CVT100 and the transmission T100, and the controllable clutch unit CL200 is additionally installed between the continuous variable transmission CVT200 and the transmission T200, to individually control through linking transmission or cutting separation between the continuous variable transmission CVT100 and the transmission T100, and between the continuous variable transmission CVT200 and the transmission T200. FIG. 6 is a schematic view showing an embodiment of the system in FIG. 5 to be additionally installed with a controllable clutch unit;

-   -   controllable clutch units CL100, CL200: related to clutch device         or structure with the function of linking transmission or         cutting separation, which is driven by manpower, and/or         electricity, and/or magnetic power, and/or machine power, and/or         gas pressurer, and/or liquid pressure, and/or centrifugal force,         and which has rotary input side and rotary output side.

The hybrid power system constituted by the multi-motor drive system with differential speed regulated by CVT and the engine power system is further additionally installed with an electric storage-discharge unit ESD100 to improve the function.

FIG. 7 is a schematic view showing an embodiment of the multi-motor drive systems with differential speed regulated by continuous variable transmission CVT, an engine power drive unit, and an electric storage-discharge unit ESD100 are simultaneously installed at a common load body L400 to form a hybrid power system.

As shown in FIG. 7, the electric storage-discharge unit ESD100 is used to accept the generating power of the generator G100 driven by the engine ICE100 for charging, and/or to accept the power of the renewable electricity generation from kinetic energy recovery by the motor M100 and/or the motor M200 for charging, and/or to accept the external power supply for charging, by way of the power provided by the electric storage-discharge unit ESD100 and/or the power generated by the generator G100, through the motor drive control circuit in the electric control unit ECU400, for controlling the operations of the motor M100 and the motor M200 driven, the components including:

-   -   common load body L400: one end of the common load installed with         the multi-motor drive system with differential speed regulated         by the continuous variable transmission CVT100 and the         continuous variable transmission CVT200;     -   another end of the common load body L400 installed with an         engine power system constituted by an engine ICE100 and a         transmission T301 with the functions of clutch, speed change,         and differential speed, for wheel group W301 and wheel group         W401 driving the load through the transmission T301;     -   motors M100, M200: constituted by rotary motors, which are AC or         DC, brushless or brush, synchronous or non-synchronous, internal         or external rotation type;     -   generator G100: constituted by rotary generator, which are AC or         DC, brushless or brush, synchronous or non-synchronous, internal         or external rotation type; in which the generator G100 is         installed between the engine ICE100 and the transmission T301,         or at the non-engine coupling side of the transmission T301, or         at the unit driven by the transmission T301;     -   continuous variable transmissions CVT100, CVT200: related to         continuous variable transmissions, which can automatically         change the speed ratio with the load state, or change the speed         ratio in accepting external manipulation, including a variety of         types, such as rubber belt type, metal belt type, and chain type         CVT, or electronic continuous variable transmission (ECVT), or         friction disk type, or conventional iso-axis continuous variable         transmission; and     -   electric control unit ECU400: constituted by electric machine         and/or solid state power element, and/or electronic element,         and/or microprocessor, and/or related software, for accepting         the control of user interface MI400 and/or central control unit         CCU400, to control the power generation operation timing of the         generator G100 and the voltage and current of the generating         power, in which one motor drive control circuit is installed         within the electric control unit ECU400 to control the         rotational speed, torque, rotary direction, and current of the         parallel motors M100 and M200; or motor drive control circuits         individually arranged for the motors M100 and M200 are installed         within the electric control unit ECU400 to individually control         the rotational speed, torque, rotary direction, and current of         the parallel motors M100 and M200, which do not involve the         close loop or semi-close loop rotational speed control between         the two motors to achieve the differential speed function; the         differential speed operation between the loads with differential         speed regulated by the continuous variable transmission CVT         installed between the individual motor and the load;

if a system adopts continuous variable transmission CVT accepting external manipulation for changing speed ratio, electric control unit ECU400 includes drive control circuits for user interface MI100 accepting artificial manipulation and/or continuous variable transmission CVT controlled by central control unit CCU400;

-   -   electric energy management unit EMU100: constituted by electric         machine and/or solid state power element, and/or electronic         element, and/or microprocessor, and/or related software, for         controlling output voltage and current and charging voltage and         current of the electric storage-discharge unit ESD100, to start         and stop charging;     -   electric storage-discharge unit ESD100: constituted by various         rechargeable secondary battery, or capacitor, or super         capacitor;     -   central control unit CCU400: related to analog or digital         control device, or both mixed, constituted by electric machine         and/or solid state power element, and/or microprocessor         including control software, and/or related circuit element, for         following the command of the user interface MI100, or for         setting control mode, and/or the feedback signal of the engine         speed detecting device SD100, and further controlling the         operation of the system;     -   user interface MI100: related to linear analog or digital         control device, or both mixed, constituted by operating         mechanism, and/or electric machine, and/or solid state circuit,         for linking with the central control unit CCU400, to control the         operation of the multi-motor drive system with differential         speed regulated by the continuous variable transmission CVT100         and the continuous variable transmission CVT200, and the         operation of the engine power system, and to drive the common         load body L400;     -   transmissions T100, T200: related to fixed speed ratio, variable         speed ratio, or stepless variable speed transmissions, which are         constituted by mechanical gear units, sprocket units, pulley         units, or linkage groups; and are selectable as needed; and     -   transmission T301: constituted by transmission component with         the functions of clutch, and/or speed change, and/or         differential speed.

By way of the operations of the above units, if the common load body L400 is driven for operation, and the wheel groups W100 and W200 installed at the load make differential speed operation, the continuous variable transmission CVT100 and the continuous variable transmission CVT200 individually make speed ratio regulation with the load variation of the wheel group W100 and the wheel group W200 installed at the load, to facilitate the differential speed operation drive between the wheel group W100 and the wheel group W200 installed at the load.

The system is installed with the required fuel control unit FC100, tank TANK100, and/or engine speed detecting device SD100 for the control of the engine drive operation, including:

-   -   fuel control unit FC100: related to power-driven servo unit         and/or mechanical/ and/or current force-type drive unit for         accepting the direct control from central control unit CCU400         and/or engine speed detecting device SD100, for controlling the         fuel supply status of the engine ICE100, and then for         controlling the rotational speed and the torque force of the         engine ICE100;     -   tank TANK100: used for engine fuel storage, through the fuel         pipeline and the fuel control unit FC100 between the tank         TANK100 and the engine ICE100, for controlling the fuel to the         engine ICE100; and     -   engine speed detecting device SD100: related to analog or         digital rotational speed detecting device, which transfers the         amount of angular displacement to the corresponding physical         signal, and/or substituted by analog voltage value or frequency         value of the generator G100, for transmitting the engine         rotational speed signal to the central control unit CCU400,         and/or directly controlling the fuel to the engine from the fuel         control unit FC100, and/or the engine speed detecting device         SD100 constituted by mechanical detecting structure, such as         centrifugal type, mechanically interacting with the fuel control         unit FC100 to control the operation of the engine ICE100; the         above types selected with the system features.

The hybrid power system installed with the electric storage-discharge unit ESD100, as shown in FIG. 7, includes one or more of the following operational functions, including:

1. the engine power system driving the wheel group W301 and the wheel group W401, for driving common load body L400;

2. the engine power system driving the wheel group W301 and the wheel group W401, for driving the common load body L400, at the same time, driving the generator G100 for charging the electric storage-discharge unit ESD100;

3. the power of the electric storage-discharge unit ESD100 through the motor drive control circuit in the electric control unit ECU400, for controlling the motor M100 and the motor M200, or renewable kinetic energy generating power from the motor M100 and/or the motor M200 for charging back to the electric storage-discharge unit ESD100;

4. the power of the electric storage-discharge unit ESD100 directly, or through the motor drive control circuit in the electric control unit ECU400, controlling the motor M100 and the motor M200, for driving the wheel group W100 and the wheel group W200, and the engine power system driving the third wheel group W300 at output side and the fourth wheel group W400 at output side, for together driving the common load body L400;

5. the engine ICE100 operating within the range of rotational speed, in which lower fuel consumption and higher output power, i.e. more fuel-efficient operation region with best break specific fuel consumption, to drive the generator G100, and the generating power directly, or through the motor drive control circuit installed within the electric control unit ECU400, controlling the operation of the motor M100 and the motor M200 driven, for driven the common load body L400;

6. the electric storage-discharge unit ESD100 accepting the generating power of the generator G100 driven by the engine ICE100 for charging, and/or the electric storage-discharge unit ESD100 charged by the external power supply, and/or renewable generating power from the motor M100 and/or the motor M200 charging back to the electric storage-discharge unit ESD100; and

7. the power of the engine ICE100 individually driving the generator G100, for charging the electric storage-discharge unit ESD100 or powering outward.

As shown in FIG. 7, the multi-motor drive system with differential speed regulated by continuous variable transmission CVT and the engine power drive unit are installed at the common load body L400, in which, for the multi-motor drive system with differential speed regulated by continuous variable transmission CVT, the load is directly driven by the continuous variable transmission CVT, or driven by the continuous variable transmission CVT and the transmission, furthermore, the controllable clutch unit CL100 is additionally installed between the continuous variable transmission CVT100 and the transmission T100, and the controllable clutch unit CL200 is additionally installed between the continuous variable transmission CVT200 and the transmission T200, to individually control through linking transmission or cutting separation between the continuous variable transmission CVT100 and the transmission T100, and between the continuous variable transmission CVT200 and the transmission T200. FIG. 8 is a schematic view showing an embodiment of the system in FIG. 7 to be additionally installed with a controllable clutch unit;

-   -   controllable clutch units CL100, CL200: related to clutch device         or structure with the function of linking transmission or         cutting separation, which is driven by manpower, and/or         electricity, and/or magnetic power, and/or machine power, and/or         gas pressurer, and/or liquid pressure, and/or centrifugal force,         and which has rotary input side and rotary output side. 

1. A multi-motor drive system with differential speed regulated by CVT, which is a multi-motor driving common load, such as two or more motors, in which CVT is installed between individual motor and a wheel group at individual load, when the multi-motor, such as two or more motors, installed at the common load structure individually drives the individual load through the arranged CVT to get rotational speed difference, and to make differential speed drive operation through the speed ratio variation by the CVT; for common load body (L100), motor (M100) is installed to drive wheel group (W100) placed at the load through continuous variable transmission (CVT100) and transmission (T100), and motor (M200) is installed to drive wheel group (W200) placed at the load through continuous variable transmission (CVT200) and transmission (T200), if the wheel group (W100) and the wheel group (W200) placed at the load are driven with differential speed, the continuous variable transmission (CVT100) and the continuous variable transmission (CVT200) automatically regulate the speed ratio with the load variation, to coordinate with differential speed between the wheel group (W100) and the wheel group (W200) placed at the load, in which: motors (M100), (M200): constituted by rotary motors, which are AC or DC, brushless or brush, synchronous or non-synchronous, internal or external rotation type; continuous variable transmissions (CVT100), (CVT200): related to continuous variable transmissions, which can automatically change the speed ratio with the load state, or change the speed ratio in accepting external manipulation, including a variety of types, such as rubber belt type, metal belt type, and chain type CVT, or electronic continuous variable transmission (ECVT), or friction disk type, or conventional iso-axis continuous variable transmission; transmission (T100): related to fixed speed ratio, variable speed ratio, or stepless variable speed transmission, which is constituted by mechanical gear unit, sprocket unit, pulley unit, or linkage group; and is selectable as needed; and electric control unit (ECU100): constituted by electric machine and/or solid state power element, and/or electronic element, and/or microprocessor, and/or related software, for accepting the control of user interface (MI100) and/or central control unit (CCU100), wherein a motor drive control circuit is installed within the electric control unit (ECU100) for manipulating rotational speed, torque, rotary direction, and current of the parallel motors (M100) and (M200); or motor drive control circuits are individually arranged for motors (M100) and (M200) individually installed within the electric control unit (ECU100), for individually manipulating rotational speed, torque, rotary direction, and current of the motors (M100) and (M200), which do not involve the close loop or semi-close loop rotational speed control between the two motors to achieve the differential speed function; the differential speed operation between the loads with differential speed regulated by the continuous variable transmission CVT installed between the individual motor and the load; if a system adopts continuous variable transmission CVT accepting external manipulation for changing speed ratio, electric control unit (ECU100) includes drive control circuits for user interface (MI100) accepting artificial manipulation and/or continuous variable transmission CVT controlled by central control unit (CCU100); electric energy management unit (EMU100): constituted by electric machine and/or solid state power element, and/or electronic element, and/or microprocessor, and/or related software, for controlling output voltage and current and charging voltage and current of the electric storage-discharge unit ESD100, to start and stop charging; central control unit (CCU100): related to analog or digital control device, or both mixed, constituted by electric machine and/or solid state power element, and/or including microprocessor, and/or control software, and/or constituted by related circuit element, for following the command of the user interface (MI100), or for setting control mode and further controlling the operation of the system; user interface (MI100): related to linear analog or digital control device, or both mixed, constituted by operating mechanism, and/or electric machine, and/or solid state circuit, for linking with the central control unit (CCU100), to control the operation of the system; and electric storage-discharge unit (ESD100): constituted by various rechargeable secondary battery, or capacitor, or super capacitor; through the operation of the above device, if common load body (L100) is driven for operation, and wheel group (W100) and wheel group (W200) make differential speed operation, which are installed at the load, continuous variable transmission (CVT100) and continuous variable transmission (CVT200) individually regulate speed ratio with the load variation of the wheel group (W100) and the wheel group (W200) installed at the load, to facilitate the differential speed operation drive between the wheel group (W100) and the second wheel group (W200) installed at the load.
 2. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 1, wherein controllable clutch unit (CL100) is additionally installed between continuous variable transmission (CVT100) and transmission (T100), and controllable clutch unit (CL200) is additionally installed between continuous variable transmission (CVT200) and transmission (T200); the controllable clutch units (CL100) and (CL200) installed between the continuous variable transmission (CVT100) and the transmission (T100), and between the continuous variable transmission (CVT200) and the transmission (T200), are used to individually control through linking transmission or cutting separation between the continuous variable transmission (CVT100) and the transmission (T100), and between the continuous variable transmission (CVT200) and the transmission (T200); controllable clutch units (CL100), (CL200): related to clutch device or structure with the function of linking transmission or cutting separation, which is driven by manpower, and/or electricity, and/or magnetic power, and/or machine power, and/or gas pressurer, and/or liquid pressure, and/or centrifugal force, and which has rotary input side and rotary output side.
 3. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 1, wherein two or more sets of the multi-motor drive systems with differential speed regulated by CVT are further installed at four- or more-wheel drive system, the main components are as following: common load body (L200): two sets of the multi-motor drive systems with differential speed regulated by CVT installed at the common load body (L200), in which the first set of the multi-motor drive system with differential speed regulated by CVT is installed at the front end of the common load body (L200), and the second set of the multi-motor drive system with differential speed regulated by CVT is installed at the back end of the common load body (L200), wherein: the first set of the multi-motor drive system with differential speed regulated by CVT includes: motors (M100), (M200): constituted by rotary motors, which are AC or DC, brushless or brush, synchronous or non-synchronous, internal or external rotation type; continuous variable transmissions (CVT100), (CVT200): related to continuous variable transmissions, which can automatically change the speed ratio with the load state, or change the speed ratio in accepting external manipulation, including a variety of types, such as rubber belt type, metal belt type, and chain type CVT, or electronic continuous variable transmission (ECVT), or friction disk type, or conventional iso-axis continuous variable transmission; and transmissions (T100), (T200): related to fixed speed ratio, variable speed ratio, or stepless variable speed transmissions, which are constituted by mechanical gear units, sprocket units, pulley units, or linkage groups; and are selectable as needed; the second set of the multi-motor drive system with differential speed regulated by CVT includes: motors (M300), (M400): constituted by rotary motors, which are AC or DC, brushless or brush, synchronous or non-synchronous, internal or external rotation type; continuous variable transmissions (CVT300), (CVT400): related to continuous variable transmissions, which can automatically change the speed ratio with the load state, or change the speed ratio in accepting external manipulation, including a variety of types, such as rubber belt type, metal belt type, and chain type CVT, or electronic continuous variable transmission (ECVT), or friction disk type, or conventional iso-axis continuous variable transmission; and transmissions (T300), (T400): related to fixed speed ratio, variable speed ratio, or stepless variable speed transmissions, which are constituted by mechanical gear units, sprocket units, pulley units, or linkage groups; and electric control unit (ECU200): constituted by electric machine and/or solid state power element, and/or electronic element, and/or microprocessor, and/or related software, for accepting the control of user interface (MI200) and/or central control unit (CCU200), wherein a motor drive control circuit is installed within the electric control unit (ECU200) for manipulating rotational speed, torque, rotary direction, and current of the parallel motors (M100) and (M200), and (M300) and (M400); or two motor drive control circuits are installed within the electric control unit (ECU200), in which one motor drive control circuit is used to control the parallel motors (M100) and (M200), including controlling the rotational speed, torque, rotary direction, and current of the motors (M100) and (M200), and another motor drive control circuit is used to control the parallel motors (M300) and (M400), including controlling the rotational speed, torque, rotary direction, and current of the motors (M300) and (M400); or motor drive control circuits are individually arranged for motors (M100), (M200), (M300), and (M400) individually installed within the electric control unit (ECU200), for individually manipulating rotational speed, torque, rotary direction, and current of the motors (M100), (M200), (M300), and (M400); which do not involve the close loop or semi-close loop rotational speed control between the two motors to achieve the differential speed function; the differential speed operation between the loads with differential speed regulated by the continuous variable transmission CVT installed between the individual motor and the load; if a system adopts continuous variable transmission CVT accepting external manipulation for changing speed ratio, electric control unit (ECU200) includes drive control circuits for user interface (MI100) accepting artificial manipulation and/or continuous variable transmission CVT controlled by central control unit (CCU200); electric control unit (ECU100): constituted by electric machine and/or solid state power element, and/or electronic element, and/or microprocessor, and/or related software, for controlling output voltage and current and charging voltage and current of the electric storage-discharge unit ESD100, to start and stop charging; central control unit (CCU200): related to analog or digital control device, or both mixed, constituted by electric machine and/or solid state power element, and/or including microprocessor, and/or control software, and/or constituted by related circuit element, for following the command of the user interface (MI100), and/or for setting control mode and further controlling the operation of the system; user interface (MI100): related to linear analog or digital control device, or both mixed, constituted by operating mechanism, and/or electric machine, and/or solid state circuit, for linking with the central control unit (CCU200), to control the operations of the first set of the multi-motor drive system with differential speed regulated by CVT, and the second set of the multi-motor drive system with differential speed regulated by CVT in turn; and electric storage-discharge unit (ESD100): constituted by various rechargeable secondary battery, or capacitor, or super capacitor.
 4. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 3, wherein the system includes one or more of the following operational functions: 1) for the first set of the multi-motor drive system with differential speed regulated by CVT installed at the front end of the common load body (L200), the continuous variable transmission (CVT100) and the continuous variable transmission (CVT200) individually regulate the speed ratio with the load variation, to coordinate with differential speed between the second wheel group (W100) and the wheel group (W200) placed at the load; 2) for the second set of the multi-motor drive system with differential speed regulated by CVT installed at the back end of the common load body (L200), the continuous variable transmission (CVT300) and the continuous variable transmission (CVT400) individually regulate the speed ratio with the load variation, to coordinate with differential speed between the wheel group (W300) and the second wheel group (W400) placed at the load; and 3) for the first and second sets of the multi-motor drive systems with differential speed regulated by CVT respectively installed at the front and back ends of the common load body (L200), between the two systems, the continuous variable transmissions (CVT100), (CVT200), (CVT300), and (CVT400) individually regulate the speed ratio with the load variation, to coordinate with differential speed among the wheel groups (W100), (W200), (W300), and (W400) placed at the load.
 5. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 3, wherein the controllable clutch unit (CL100) is additionally installed between the continuous variable transmission (CVT100) and the transmission (T100), and the controllable clutch unit (CL200) is additionally installed between the continuous variable transmission (CVT200) and the transmission (T200), and for the second set of the multi-motor drive system with differential speed regulated by CVT, the controllable clutch unit (CL300) is additionally installed between the continuous variable transmission (CVT300) and the transmission (T300), and the controllable clutch unit (CL400) is additionally installed between the continuous variable transmission (CVT400) and the transmission (T400); the controllable clutch units (CL100) and (CL200) installed between the continuous variable transmission (CVT100) and the transmission (T100), and between the continuous variable transmission (CVT200) and the transmission (T200), are used to individually control through linking transmission or cutting separation between the continuous variable transmission (CVT100) and the transmission (T100), and between the continuous variable transmission (CVT200) and the transmission (T200); the controllable clutch units (CL300) and (CL400) installed between the continuous variable transmission (CVT300) and the transmission (T300), and between the continuous variable transmission (CVT400) and the transmission (T400), are used to individually control through linking transmission or cutting separation between the continuous variable transmission (CVT300) and the transmission (T300), and between the continuous variable transmission (CVT400) and the transmission (T400); controllable clutch units (CL100), (CL200), (CL300), (CL400): related to clutch device or structure with the function of linking transmission or cutting separation, which is driven by manpower, and/or electricity, and/or magnetic power, and/or machine power, and/or gas pressurer, and/or liquid pressure, and/or centrifugal force, and which has rotary input side and rotary output side.
 6. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 1, wherein the system is further applied to hybrid power drive system; the main components are as following: common load body (L300): one end of the common load installed with the multi-motor drive system with differential speed regulated by the continuous variable transmission (CVT100) and the continuous variable transmission (CVT200); another end of the common load body (L300) installed with an engine power system constituted by an engine (ICE100) and a transmission T301 with the functions of clutch, speed change, and differential speed, for wheel group (W301) and wheel group (W401) driving the load through the transmission T301; motors (M100), (M200): constituted by rotary motors, which are AC or DC, brushless or brush, synchronous or non-synchronous, internal or external rotation type; generator (G100): constituted by generator, which are AC or DC, brushless or brush, synchronous or non-synchronous, internal or external rotation type; in which the generator (G100) is installed between the engine (ICE100) and the transmission (T301), or at the non-engine coupling side of the transmission (T301), or at the unit driven by the transmission (T301); continuous variable transmissions (CVT100), (CVT200): related to continuous variable transmissions, which can automatically change the speed ratio with the load state, or change the speed ratio in accepting external manipulation, including a variety of types, such as rubber belt type, metal belt type, and chain type CVT, or electronic continuous variable transmission (ECVT), or friction disk type, or conventional iso-axis continuous variable transmission; and electric control unit (ECU300): constituted by electric machine and/or solid state power element, and/or electronic element, and/or microprocessor, and/or related software, for accepting the control of user interface (MI300) and/or central control unit (CCU300), to control the power generation operation timing of the generator (G100) and the voltage and current of the generating power, in which one motor drive control circuit is installed within the electric control unit (ECU300) to control the rotational speed, torque, rotary direction, and current of the parallel motors (M100) and (M200); or motor drive control circuits individually arranged for the motors (M100) and (M200) are installed within the electric control unit (ECU300) to individually control the rotational speed, torque, rotary direction, and current of the parallel motors (M100) and (M200), which do not involve the close loop or semi-close loop rotational speed control between the two motors to achieve the differential speed function; the differential speed operation between the loads with differential speed regulated by the continuous variable transmission CVT installed between the individual motor and the load; if a system adopts continuous variable transmission CVT accepting external manipulation for changing speed ratio, electric control unit (ECU300) includes drive control circuits for user interface (MI100) accepting artificial manipulation and/or continuous variable transmission CVT controlled by central control unit (CCU300); central control unit (CCU300): related to analog or digital control device, or both mixed, constituted by electric machine and/or solid state power element, and/or microprocessor including control software, and/or related circuit element, for following the command of the user interface (MI100), or for setting control mode, and/or the feedback signal of the engine speed detecting device (SD100), and further controlling the operation of the system; user interface (MI100): related to linear analog or digital control device, or both mixed, constituted by operating mechanism, and/or electric machine, and/or solid state circuit, for linking with the central control unit (CCU300), to control the operation of the multi-motor drive system with differential speed regulated by the continuous variable transmission (CVT100) and the continuous variable transmission (CVT200), and the operation of the engine power system; transmissions (T100), (T200): related to fixed speed ratio, variable speed ratio, or stepless variable speed transmissions, which are constituted by mechanical gear units, sprocket units, pulley units, or linkage groups; and are selectable as needed; and transmission T301: constituted by transmission component with the functions of clutch, and/or speed change, and/or differential speed; by way of the operations of the above units, if the common load body (L300) is driven for operation, and the wheel groups (W100) and (W200) installed at the load make differential speed operation, the continuous variable transmission (CVT100) and the continuous variable transmission (CVT200) individually make speed ratio regulation with the load variation of the wheel group (W100) and the wheel group (W200) installed at the load, to facilitate the differential speed operation drive between the wheel group (W100) and the second wheel group (W200) installed at the load; the system is installed with the required fuel control unit (FC100), tank (TANK100), and/or engine speed detecting device (SD100) for the control of the engine drive operation, including: fuel control unit (FC100): related to power-driven servo unit and/or mechanical/ and/or current force-type drive unit for accepting the direct control from central control unit (CCU300) and/or engine speed detecting device (SD100), for controlling the fuel supply status of the engine (ICE100), and then for controlling the rotational speed and the torque force of the engine (ICE100); tank (TANK100): used for engine fuel storage, through the fuel pipeline and the fuel control unit (FC100) between the tank (TANK100) and the engine (ICE100), for controlling the fuel to the engine (ICE100); and engine speed detecting device (SD100): related to analog or digital rotational speed detecting device, which transfers the amount of angular displacement to the corresponding physical signal, and/or substituted by analog voltage value or frequency value of the generator (G100), for transmitting the engine rotational speed signal to the central control unit (CCU300), and/or directly controlling the fuel to the engine from the fuel control unit (FC100), and/or the engine speed detecting device (SD100) constituted by mechanical detecting structure, such as centrifugal type, mechanically interacting with the fuel control unit (FC100) to control the operation of the engine (ICE100); the above types selected with the system features.
 7. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 6, wherein the system includes one or more of the following operational functions, including: the power system, driven by the engine (ICE100), driving the wheel group (W301) and the wheel group (W401), for driving the common load body (L300); and/or the engine (ICE100) operating within the range of rotational speed, in which lower fuel consumption and higher output power, i.e. more fuel-efficient operation region with best break specific fuel consumption, to drive the generator (G100), and the generating power directly, or through the motor drive control circuit installed within the electric control unit (ECU300), controlling the operation of the motor (M100) and the motor (M200) driven, for driven the common load body (L300).
 8. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 6, wherein the controllable clutch unit (CL100) is additionally installed between the continuous variable transmission (CVT100) and the transmission (T100), and the controllable clutch unit (CL200) is additionally installed between the continuous variable transmission (CVT200) and the transmission (T200), to individually control through linking transmission or cutting separation between the continuous variable transmission (CVT100) and the transmission (T100), and between the continuous variable transmission (CVT200) and the transmission (T200); controllable clutch units (CL100), (CL200): related to clutch device or structure with the function of linking transmission or cutting separation, which is driven by manpower, and/or electricity, and/or magnetic power, and/or machine power, and/or gas pressurer, and/or liquid pressure, and/or centrifugal force, and which has rotary input side and rotary output side.
 9. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 6 and the engine power system constituting the hybrid power system, wherein the hybrid power system is further additionally installed with an electric storage-discharge unit (ESD100) to improve the function; the components are as following: common load body (L400): one end of the common load installed with the multi-motor drive system with differential speed regulated by the continuous variable transmission (CVT100) and the continuous variable transmission (CVT200); another end of the common load body (L400) installed with an engine power system constituted by an engine (ICE100) and a transmission (T301) with the functions of clutch, speed change, and differential speed, for wheel group (W301) and wheel group (W401) driving the load through the transmission T301; motors (M100), (M200): constituted by rotary motors, which are AC or DC, brushless or brush, synchronous or non-synchronous, internal or external rotation type; generator (G100): constituted by rotary generator, which are AC or DC, brushless or brush, synchronous or non-synchronous, internal or external rotation type; in which the generator (G100) is installed between the engine (ICE100) and the transmission (T301), or at the non-engine coupling side of the transmission (T301), or at the unit driven by the transmission (T301); continuous variable transmissions (CVT100), (CVT200): related to continuous variable transmissions, which can automatically change the speed ratio with the load state, or change the speed ratio in accepting external manipulation, including a variety of types, such as rubber belt type, metal belt type, and chain type CVT, or electronic continuous variable transmission (ECVT), or friction disk type, or conventional iso-axis continuous variable transmission; and electric control unit (ECU400): constituted by electric machine and/or solid state power element, and/or electronic element, and/or microprocessor, and/or related software, for accepting the control of user interface (MI400) and/or central control unit (CCU400), to control the power generation operation timing of the generator (G100) and the voltage and current of the generating power, in which one motor drive control circuit is installed within the electric control unit (ECU400) to control the rotational speed, torque, rotary direction, and current of the parallel motors (M100) and (M200); or motor drive control circuits individually arranged for the motors (M100) and (M200) are installed within the electric control unit (ECU400) to individually control the rotational speed, torque, rotary direction, and current of the parallel motors (M100) and (M200), which do not involve the close loop or semi-close loop rotational speed control between the two motors to achieve the differential speed function; the differential speed operation between the loads with differential speed regulated by the continuous variable transmission CVT installed between the individual motor and the load; if a system adopts continuous variable transmission CVT accepting external manipulation for changing speed ratio, electric control unit (ECU400) includes drive control circuits for user interface (MI100) accepting artificial manipulation and/or continuous variable transmission CVT controlled by central control unit (CCU400); electric energy management unit (EMU100): constituted by electric machine and/or solid state power element, and/or electronic element, and/or microprocessor, and/or related software, for controlling output voltage and current and charging voltage and current of the electric storage-discharge unit ESD100, to start and stop charging; electric storage-discharge unit (ESD100): constituted by various rechargeable secondary battery, or capacitor, or super capacitor; central control unit (CCU400): related to analog or digital control device, or both mixed, constituted by electric machine and/or solid state power element, and/or microprocessor including control software, and/or related circuit element, for following the command of the user interface (MI100), or for setting control mode, and/or the feedback signal of the engine speed detecting device (SD100), and further controlling the operation of the system; user interface (MI100): related to linear analog or digital control device, or both mixed, constituted by operating mechanism, and/or electric machine, and/or solid state circuit, for linking with the central control unit (CCU400), to control the operation of the multi-motor drive system with differential speed regulated by the continuous variable transmission (CVT100) and the continuous variable transmission (CVT200), and the operation of the engine power system, and to drive the common load body (L400); transmissions (T100), (T200): related to fixed speed ratio, variable speed ratio, or stepless variable speed transmissions, which are constituted by mechanical gear units, sprocket units, pulley units, or linkage groups; and are selectable as needed; and transmission (T301): constituted by transmission component with the functions of clutch, and/or speed change, and/or differential speed; by way of the operations of the above units, if the common load body (L400) is driven for operation, and the wheel groups (W100) and (W200) installed at the load make differential speed operation, the continuous variable transmission (CVT100) and the continuous variable transmission (CVT200) individually make speed ratio regulation with the load variation of the wheel group (W100) and the wheel group (W200) installed at the load, to facilitate the differential speed operation drive between the wheel group (W100) and the wheel group (W200) installed at the load; the system is installed with the required fuel control unit (FC100), tank (TANK100), and/or engine speed detecting device (SD100) for the control of the engine drive operation, including: fuel control unit (FC100): related to power-driven servo unit and/or mechanical and/or current force-type drive unit for accepting the direct control from central control unit (CCU400) and/or engine speed detecting device (SD100), for controlling the fuel supply status of the engine (ICE100), and then for controlling the rotational speed and the torque force of the engine (ICE100); tank (TANK100): used for engine fuel storage, through the fuel pipeline and the fuel control unit (FC100) between the tank (TANK100) and the engine (ICE100), for controlling the fuel to the engine (ICE100); and engine speed detecting device (SD100): related to analog or digital rotational speed detecting device, which transfers the amount of angular displacement to the corresponding physical signal, and/or substituted by analog voltage value or frequency value of the generator (G100), for transmitting the engine rotational speed signal to the central control unit (CCU400), and/or directly controlling the fuel to the engine from the fuel control unit (FC100), and/or the engine speed detecting device (SD100) constituted by mechanical detecting structure, such as centrifugal type, mechanically interacting with the fuel control unit (FC100) to control the operation of the engine (ICE100); the above types selected with the system features.
 10. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 9, wherein the system includes one or more of the following operational functions, including: 1) the engine power system driving the wheel group (W301) and the wheel group (W401), for driving common load body (L400); 2) the engine power system driving the wheel group (W301) and the wheel group (W401), for driving the common load body (L400), at the same time, driving the generator (G100) for charging the electric storage-discharge unit (ESD100); 3) the power of the electric storage-discharge unit (ESD100) through the motor drive control circuit in the electric control unit (ECU400), for controlling the motor (M100) and the motor (M200), or renewable kinetic energy generating power from the motor (M100) and/or the motor (M200) for charging back to the electric storage-discharge unit (ESD100); 4) the power of the electric storage-discharge unit (ESD100) directly, or through the motor drive control circuit in the electric control unit (ECU400), controlling the motor (M100) and the motor (M200), for driving the wheel group (W100) and the wheel group (W200), and the engine power system driving the third wheel group (W300) at output side and the fourth wheel group (W400) at output side, for together driving the common load body (L400); 5) the engine (ICE100) operating within the range of rotational speed, in which lower fuel consumption and higher output power, i.e. more fuel-efficient operation region with best break specific fuel consumption, to drive the generator (G100), and the generating power directly, or through the motor drive control circuit installed within the electric control unit (ECU400), controlling the operation of the motor (M100) and the motor (M200) driven, for driven the common load body (L400); 6) the electric storage-discharge unit (ESD100) accepting the generating power of the generator (G100) driven by the engine (ICE100) for charging, and/or the electric storage-discharge unit (ESD100) charged by the external power supply, and/or renewable generating power from the motor (M100) and/or the motor (M200) charging back to the electric storage-discharge unit (ESD100); and 7) the power of the engine (ICE100) individually driving the generator (G100), for charging the electric storage-discharge unit (ESD100) or powering outward.
 11. The multi-motor drive system with differential speed regulated by CVT as claimed in claim 9, wherein the controllable clutch unit (CL100) is additionally installed between the continuous variable transmission (CVT100) and the transmission (T100), and the controllable clutch unit (CL200) is additionally installed between the continuous variable transmission (CVT200) and the transmission (T200), to individually control through linking transmission or cutting separation between the continuous variable transmission (CVT100) and the transmission (T100), and between the continuous variable transmission (CVT200) and the transmission (T200); controllable clutch units (CL100), (CL200): related to clutch device or structure with the function of linking transmission or cutting separation, which is driven by manpower, and/or electricity, and/or magnetic power, and/or machine power, and/or gas pressurer, and/or liquid pressure, and/or centrifugal force, and which has rotary input side and rotary output side. 